diff --git a/reference/datetime/functions/gmdate.xml b/reference/datetime/functions/gmdate.xml
index a960892813..fb47bf40e6 100644
--- a/reference/datetime/functions/gmdate.xml
+++ b/reference/datetime/functions/gmdate.xml
@@ -11,7 +11,7 @@
   <methodsynopsis>
    <type>string</type><methodname>gmdate</methodname>
    <methodparam><type>string</type><parameter>format</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>timestamp</parameter></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>timestamp</parameter><initializer>time()</initializer></methodparam>
   </methodsynopsis>
   <para>
    Identical to the <function>date</function> function except that